EP2104926B1 - Displaying elevation information from a digital map - Google Patents

Displaying elevation information from a digital map Download PDF

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Publication number
EP2104926B1
EP2104926B1 EP08701086A EP08701086A EP2104926B1 EP 2104926 B1 EP2104926 B1 EP 2104926B1 EP 08701086 A EP08701086 A EP 08701086A EP 08701086 A EP08701086 A EP 08701086A EP 2104926 B1 EP2104926 B1 EP 2104926B1
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EP
European Patent Office
Prior art keywords
shading
elevation
function
information
display
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EP08701086A
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German (de)
English (en)
French (fr)
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EP2104926A1 (en
Inventor
Alexandru Serbanescu
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TomTom International BV
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TomTom International BV
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
    • G06T17/05—Geographic models
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G01C21/34—Route searching; Route guidance
    • G01C21/36—Input/output arrangements for on-board computers
    • G01C21/3626—Details of the output of route guidance instructions
    • G01C21/3635—Guidance using 3D or perspective road maps
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/001—Texturing; Colouring; Generation of texture or colour
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
    • G09B29/10—Map spot or coordinate position indicators; Map reading aids
    • G09B29/106—Map spot or coordinate position indicators; Map reading aids using electronic means

Definitions

  • This invention relates to an apparatus and method for generating a display from a digital map, the display including a representation of elevation information.
  • the invention is especially suitable for navigation devices, including portable navigation devices (so-called PNDs), but may find utility in any type of processing device for generating a display from digital map information.
  • isolines also called contour lines
  • shading of the map colour to represent elevation information.
  • isolines may provide an accurate representation of elevation
  • isolines can clutter the map display and are not intuitive to all users. Map clutter may be a particular problem when displaying the map on a relatively small electronic display device, or when it is also desired to display other map information such as navigation and location information.
  • Shading can provide a more intuitive representation of elevation information without cluttering the display.
  • shadeing means applying a darkening and/or lightening of the map colour, akin to a positive or negative shadow.
  • a conventional technique for shading is to include the shading as a static feature of the map colour in the digital map.
  • a digital map 12 is generated by processing map source information 10 that includes elevation data, to create the shading as a static template within the background colour in the digital map 12.
  • a rendering process 14 is used to generate an image 18 including the fixed elevation shading template at a desired display scale represented by a display scale input 16.
  • the shading is fixed as part of the digital map 12, and is not adaptive.
  • the shading pattern also depends on the specific shading technique used when creating the digital map 12. Different shading techniques create different shading patterns based on the same elevation data. While a certain shading technique may be suited to displaying the map at a certain display scale, generating a display at other display scales can require interpolation or averaging of the shading pattern. This can create severe inaccuracies in the elevation shading. For example, as the display scale is varied, peaks and valleys in the elevation may appear to change shape and location as a result of averaging or interpolation inaccuracies.
  • the present invention has been devised bearing the above problems in mind.
  • a presently preferred embodiment of the present invention provides a method of rendering a display image generated from digital map information.
  • the method includes the steps of:
  • the shading value varies as a function of the elevation information and the display scale information, whereby the display is generated to represent elevation information by pixel shading that varies with display scale.
  • the system may comprise an automomous device, such as a portable navigation device, a portable map viewer, a device including a positioning system (for example, a satellite based positioning system such as a Global Positioning System (GPS)), a portable digital assistant (PDA), a portable computer, or non-portable computer.
  • a positioning system for example, a satellite based positioning system such as a Global Positioning System (GPS)
  • PDA portable digital assistant
  • the system may comprise a server storing the digital map, and a remote terminal or computer configured to generate a display of the digital map based on information received from the server over one or more networks, such as an internet or intranet.
  • a remote terminal or computer configured to generate a display of the digital map based on information received from the server over one or more networks, such as an internet or intranet.
  • One application for which provision of elevation information is especially useful is for a pedestrian and hiking navigation device or system.
  • FIG. 2 illustrates schematically a technique for generating a map display including elevation shading in a preferred embodiment.
  • a digital map 20 includes elevation information 20a indicative of elevation at different points in the digital map 20.
  • the digital map 20 may be a database of map information stored in any suitable storage medium, for example but not limited to, an optical storage medium, non-volatile electronic memory, volatile electronic memory, a magnetic storage medium, or a magneto-optical storage medium.
  • the elevation information 20a may represent a grid of values (a matrix of points). It makes no difference the way the data is stored.
  • the surface of the Earth may be divided in some small patches of 3" in latitude and 3" in longitude.
  • a map rendering module 22 dynamically renders a display image 24 based on (i) map information 26 received from the digital map 20, (ii) elevation information 26a also received from the digital map 20, and (iii) display scale information 28 indicating the display scale of the image 24, ie. the degree to which the map image is zoomed in towards, or zoomed out from, the map.
  • the display scale is represented by a notional viewing (or zoom-out) height value "z" above the map.
  • a relatively large display scale is represented by a respectively small value of z, and a relatively small display scale is respresented by a respectively large value of z.
  • the map rendering module 22 may comprise dedicated graphics processor circuitry and/or rendering software executed by a general purpose processor.
  • the map rendering module 22 is configured to render the map by applying a shading algorithm that darkens and/or lightens the map color to represent elevation in the map image 24.
  • the output will be represented by the percentage of shading applied to each pixel on the screen.
  • the screen is normally represented by a matrix of pixels, which gives the resolution of the screen.
  • Each pixel has a colour associated with, in this case, the form of relief that it represents (for example, different colours for meadow, forest, built area, etc.), as represented by the map information 26.
  • shadeing percentage is an indication of the extent that the colour should be darkened or made lighter (whitened). A negative shading percentage takes the colour closer to white, and a positive shading percentage takes the colour closer to black.
  • the shading algorithm is a function of (i) the elevation information 20a/26a from the digital map 20, and (ii) the display scale information 28.
  • the shading algorithm is configured to vary the shading style based on the same elevation information, as a varying function of the display scale information. In other words, as the display scale is varied, not just the magnification of the shading is varied, but also the style of shading. This enables the style of shading to be adapted to the display scale of the image 24.
  • a first shading style is to apply shading that depends on the absolute elevation of an individual point in the image.
  • a typical shading pattern produced using predominantly this style is illustrated in Fig. 5f .
  • Darker image shading represents points of higher elevation. For example, peaks 30 are indicated by areas of local maxima in darkness shading, whereas valleys 32 are indicated by areas of local minima in darkness (local maxima in lightness).
  • This first type of shading style is suitable for relatively small display scales (high zoom out away from the map), in which there may be significant changes in absolute elevation in close proximity in the map image.
  • the first shading style is less suitable for relatively large display scales (zoomed in towards the map), in which the elevation may be substantially the same across the entire display image, leading to almost constant shading that obscures local relief features.
  • a very different second shading style is based on elevation slope, namely the difference in elevation between adjacent points in the display image, taken in a certain sampling direction, for example, from North-West to South-East.
  • a negative slope is rendered with one type of shading (e.g. with a lighter colour 34), and a positive slope with another type of shading (e.g. a darker colour 36). The steeper the slope the lighter or respective darker the colour that is used.
  • a typical shading pattern produced using predominantly this style is illustrated in Fig. 5a .
  • This second shading style is suited to large display scales (zoomed in towards the map), it is more responsive to local relief detail even though the absolute elevation may change only fractionally, and can generate intuitive shading for large display scale.
  • the second shading style technique is less well suited to small display scale, where two display points on which the slope is calculated may be geographically remote, and so calculating an elevation slope between these points may not provide useful information. For example, if the two display points are of about the same elevation, but on opposite sides of a mountain peak, then the peak will not be represented by any shading using the second technique, because there is little difference between the elevations at the two display points, and important elevation features can easily be lost.
  • the shading algorithm preferably combines first and second different shading functions or styles, each weighted by a respective coefficient indicating the respective strength of contribution of each shading function as a component of the shading algorithm.
  • the coefficients vary as a function of the display scale information 28 (for example, the zoom out height "z"). More preferably, the coefficients vary as a substantially continuous function of the display scale information.
  • a single coefficient l ( z ) may be used, where l ( z ) takes values between zero and 1, ( l ( z ) ⁇ [0,1]), with l ( z ) representing the weight of one shading function, and 1- l ( z ) representing the weight of the other shading function.
  • the coefficient l ( z ) could vary linearly as a function of the display scale "z". However, referring to Fig. 3 , it is preferred that l ( z ) vary asymptotically between two limits as a function of the display scale. At large and medium display scales (small and medium “zoom-out” levels “z" away from the map), the predominant shading function is the slope based shading function (second shading function) and at small display scales (high “zoom-out” level "z"), the predominant shading function is the absolute elevation based function (first shading function). The value of l is big in the first case and small in the second.
  • the function l (z) is preferably chosen to be composed by a sequence of two Bezier spline curve.
  • the main idea behind this approach is to use a function which is "almost" asymptotic towards 0 when z approaches A and "almost” asymptotic towards 1 when z approaches E.
  • the zoom value z in A as the lowest zoom level considered in this case and the value in E as the highest.
  • Choosing a sequence of two Bezier splines can achieve the freedom to choose different convergence rates for the evolution up to the break even point C and for the one afterwards. It is essentially this type of evolution and the solution chosen which gives to the solution an optimal transition between the two criteria.
  • the control points A, B, C, D, E can be tuned to achieve the optimal transition between the two shading criteria.
  • the main formula also includes two sub-unitary, or secondary, weight functions for "tuning" the combined shading effect.
  • the W 1 (sin( ⁇ )) component is a sub-unitary weight function which tries to attenuate the height values of the slope and has a descending hyperbolic graphic, which "almost” asymptotically approach a minimum value when sin( ⁇ ) approaches 1 (as illustrated in Fig. 4 ).
  • W 2 (h) has the same type of evolution but this time as h approaches the conventional maximal value of the altitude.
  • Fig. 5 illustrates a range of screenshots for different zoom out levels to illustrate the way the method works.
  • the screenshots show how the shading algorithm works for a region in the Alps (around Alagna Valssesia in Italy) starting from the medium zoom levels to the higher ones.
  • the elevation information 20a is provided as absolute elevation information for points in the digital map 20, and the rending module 22 performs all of the calculations necessary to calculate a shading percentage to apply to each display pixel.
  • the elevation information 20a could, alternatively or additionally, include pre-calculated values (for example of one or more of h, ⁇ , P height ( h ), P slope ( ⁇ ) , and/or l ( z )), for use in the shading algorithm, to reduce the calculation burden within the rendering module.
  • the elevation information 20a may be represented directly as the pre-calculated shading percentages according to the first and second different shading functions.
  • the shading percentages may be pre-calculated in the digital map 20
  • the provision of at least first and second different shading percentages for the same point can enable dynamic rending according to the display scale, by applying a weighted combination of the two pre-calculated percentages using the same principles as described above.
  • Fig. 2 such additional elevation information is represented in the digital map 20 at 20b.
  • the shading algorithm has been expressed as a mathematical function that may be calculated on demand by a suitable processor
  • a function map containing pre-calculated values, for example, as a function of look-up coordinate variables ( ⁇ the angle of the elevation slope, h the current height (elevation), and z the zoom-out level (display scale)).
  • ⁇ the angle of the elevation slope
  • h the current height
  • z the zoom-out level
  • Such a pre-calculated function map could be provided within the map display apparatus, or it could be incorporated as an integral part of the data representing the digital map 20 (represented in Fig. 2 at 20c).
  • Figs. 6, 7 and 8 represent different types of apparatus that may implement the techniques of the preferred embodiment.
  • Fig. 6 illustrates a handheld PND 50
  • Fig. 7 illustrates a PND 52 suitable for in-vehicle use.
  • the PNDs 50 and 52 typically store the digital map 20 by using semiconductor and/or magnetic memory media.
  • the PNDs 50 and 52 typically include a local processor, that implements the rendering module 22 by execution of software.
  • Fig. 8 illustrates a networked computer system 60 comprising a server 62 communicating with one or more terminals 64 via a network 66.
  • the network 66 may include a local intranet and/or a wider internet (such as the world-wide-web).
  • the server 62 stores the digital map 20 and supplies map image generation information upon demand to a requesting terminal 64.
  • the server 62 may perform the image calculation, including the function of the map rendering module 22, in order to provide an already-rendered image to the terminal 64 for display.
  • the terminal 64 may perform the image calculation, including the function of the map rendering module 22, based on unrendered information received from the server 62.
  • the function of the map rendering module 22 may be divided amongst both the server 62 and the terminal 64, to include both server processing and local terminal processing.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Software Systems (AREA)
  • Automation & Control Theory (AREA)
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  • Business, Economics & Management (AREA)
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EP08701086A 2007-01-10 2008-01-09 Displaying elevation information from a digital map Active EP2104926B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US87960707P 2007-01-10 2007-01-10
PCT/EP2008/000182 WO2008083979A1 (en) 2007-01-10 2008-01-09 Displaying elevation information from a digital map

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EP2104926A1 EP2104926A1 (en) 2009-09-30
EP2104926B1 true EP2104926B1 (en) 2012-07-25

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US (1) US8553946B2 (pt)
EP (1) EP2104926B1 (pt)
JP (1) JP2010515941A (pt)
CN (1) CN101578636A (pt)
AR (1) AR064840A1 (pt)
AU (1) AU2008204558A1 (pt)
RU (1) RU2009130385A (pt)
TW (1) TW200839188A (pt)
WO (1) WO2008083979A1 (pt)

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KR20130080163A (ko) * 2012-01-04 2013-07-12 삼성전자주식회사 클라이언트의 전자 지도 표시 방법 및 장치
TW201405098A (zh) * 2012-07-18 2014-02-01 Tian-Min Gao 地圖及搜尋地圖之方法
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RU2009130385A (ru) 2011-02-20
CN101578636A (zh) 2009-11-11
AU2008204558A1 (en) 2008-07-17
TW200839188A (en) 2008-10-01
US8553946B2 (en) 2013-10-08
AR064840A1 (es) 2009-04-29
US20080212893A1 (en) 2008-09-04
WO2008083979A1 (en) 2008-07-17
EP2104926A1 (en) 2009-09-30
JP2010515941A (ja) 2010-05-13

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